22
12.4 Adjustment of impeller clearance
For position numbers, see page 552, 553 or 554.
Proceed as follows:
1.
DP pumps only:
Slacken and remove the screws
(pos. 188c) holding the suction strainer (pos. 84).
Remove the strainer.
2. Slacken the locking screws (pos. 188b).
3. Slacken the adjusting screws (pos. 189), and
push the wear plate until it touches the impeller.
4. Tighten the adjusting screws so that the wear
plate still touches the impeller. Then slacken all
the adjusting screws about half a turn.
5. Tighten the locking screws.
6. Rotate the impeller by hand to check that it is not
touching the wear plate.
7.
DP pumps only:
Fit the suction strainer. Fit and
tighten the screws (pos. 188c).
See also section
12.5 Cleaning the pump housing
Fig. 15
Pump viewed from suction port
12.5 Cleaning the pump housing
For position numbers, see page 552, 553 or 554.
To clean the pump housing, proceed as follows:
Dismantling
1. Loosen and remove the clamp (pos. 92) holding
the pump housing and motor together.
2. Lift the motor part out of the pump housing
(pos. 50). The impeller is removed together with
the motor part.
3. Clean the pump housing and the impeller.
Assembly
1. Place the motor part with impeller in the pump
housing.
2. Fit and tighten the clamp.
See also section
12.7 Checking/replacing the shaft
.
12.6 Cleaning the sensors
Fig. 16
Position of level and dry-running sensors
Proceed as follows:
See fig. 16.
1.
Level sensor (pos. 7):
Flush the sensor with clean water.
Dry-running sensors (pos. 10):
Flush the dry-running sensors with clean water
and clean using a soft brush.
2. Switch on the power supply to the pump.
3. Check that the pump starts and pumps down to
the dry-running level.
12.7 Checking/replacing the shaft seal
To make sure that the shaft seal is intact, the oil
should be checked.
If the oil contains more than 20 % water, the shaft
seal may be defective and must be replaced. If the
shaft seal is nevertheless used, the motor will be
damaged.
If the oil is clean, it can be reused. See also section
.
For position numbers, see page 552, 553 or 554.
Caution
The impeller must be able to rotate
freely without touching the wear plate.
T
M
04
4
7
9
5
21
09
TM
04 486
0 210
9
Caution
To avoid damaging the sensors, do not
use other cleaning aid than those
mentioned above.
Note
If the dry-running sensors are not
covered by liquid, the pump cannot
start.
